KEF Q90 (1990–1994)

Name: KEF Q90
Brand: KEF

A British-built, three-way floorstanding loudspeaker with Uni-Q technology and a front-ported bass reflex design.

Overview

The KEF Q90 is a passive floorstanding loudspeaker from the early 1990s, part of KEF's Uni-Q series. It was built in England between 1990 and 1994 and was the flagship of the Q lineup. It was meant for listeners who wanted a three-way system along with the spatial coherence of KEF's Uni-Q driver array. The enclosure is bass reflex with a front-firing port, and the speaker supports bi-wiring. The system designation is SP3138. KEF intended the Q90 to offer extended frequency response and dynamic headroom, which made it suitable for critical stereo listening and multi-channel setups.

Specifications

Type	3-way floor standing
System	SP3138
Enclosure	Bass Reflex
Port Position	Front
Impedance	8 ohms
Frequency Response	51 Hz to 28 kHz
Dimensions (H × W × D)	890 × 260 × 330 mm (35 × 10.2 × 13.6 in.)
Net Weight	18.7 kg (41.1 lb)
Unit Quantity	2 (pair)
Bi-wire	Yes

Design

Uni-Q puts the tweeter at the acoustic center of the midrange cone. That gives a single point source, with better time coherence and more consistent dispersion. The cabinet is front-ported bass reflex, which extends the low end and improves output efficiency.

Context

The Q90 was the top model in KEF's Q series, aimed at audiophiles who wanted a full three-way system. The design goals were spatial accuracy and dynamic range, with an emphasis on compatibility and flexibility.

Market

Used pairs have been listed at prices from $150 to $350, and some units are noted as being in good physical and working condition. One owner called the sound “muddy in stereo but wonderful in 5.1,” which points to strong performance in surround setups.